Don't import Rollbar as a namespace in the Angular example

[matux]

Description of the change

The Angular example was importing Rollbar as a namespace which was causing these errors during npm run build:

✘ [ERROR] TS2709: Cannot use namespace 'Rollbar' as a type. [plugin angular-compiler]

    src/app/app.component.ts:17:27:
      17 │   private rollbar = inject<Rollbar>(RollbarService);
         ╵                            ~~~~~~~


✘ [ERROR] TS2709: Cannot use namespace 'Rollbar' as a type. [plugin angular-compiler]

    src/app/rollbar.errorhandler.ts:6:49:
      6 │ export const RollbarService = new InjectionToken<Rollbar>('rollbar');
        ╵                                                  ~~~~~~~

It's not recommended to import Rollbar as a namespace:
https://docs.rollbar.com/docs/importing-or-requiring-rollbar#namespace-import-syntax-not-recommended

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Related issues

SDK-518/make-sure-all-sdk-examples-work-properly

[Copilot]

Pull Request Overview

This PR fixes TypeScript compilation errors in the Angular example by changing from namespace imports to default imports for Rollbar, following the recommended import pattern from Rollbar's documentation.

• Changes Rollbar import from namespace syntax (import * as Rollbar) to default import syntax (import Rollbar)
• Resolves TS2709 compilation errors that occurred during npm run build

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
examples/angular/src/app/rollbar.errorhandler.ts	Updates Rollbar import from namespace to default import
examples/angular/src/app/app.component.ts	Updates Rollbar import from namespace to default import